CN111035948A - Atomizing device for evaporating pressure return liquid - Google Patents
Atomizing device for evaporating pressure return liquid Download PDFInfo
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- CN111035948A CN111035948A CN201811196573.0A CN201811196573A CN111035948A CN 111035948 A CN111035948 A CN 111035948A CN 201811196573 A CN201811196573 A CN 201811196573A CN 111035948 A CN111035948 A CN 111035948A
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- tank
- blow
- return
- liquid
- valve control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nozzles (AREA)
Abstract
The invention provides an atomization device for evaporating return liquid, which comprises: the open flow tank is used for receiving the pressure return liquid; the storage tank is used for temporarily storing the pressure return liquid; the atomization spraying assembly comprises a spray pipe and a nozzle which is connected with the spray pipe and extends into the blowout pool; and the valve control mechanism is connected with the spraying tank, the storage tank and the atomization spraying assembly. The valve control mechanism is configured to selectively deliver the return hydraulic fluid from the blow tank to a storage tank for storage or to an atomizing spray assembly for injection through the nozzle into the blow tank. Thus, the heat energy of the blowout ignition flame which is wasted originally can be utilized to evaporate the return liquid, so that the return liquid can be treated in an environment-friendly manner without any additional cost.
Description
Technical Field
The invention relates to the field of oil and natural gas exploitation, in particular to an atomization device for evaporating return liquid.
Background
The hydraulic fracturing transformation is a main means for efficiently developing a low-permeability compact gas reservoir of a gas field and is also an important means for obtaining ideal energy production of a shale gas reservoir. The aim of hydraulic fracturing modification is to form a high-conductivity fracture in a reservoir and improve the migration capacity of natural gas in the fracture. The main working fluid type adopted in the fracturing modification is water-based fracturing fluid, and a large amount of gel-breaking fracturing fluid is drained back to the ground under the action of formation pressure after the construction is finished.
In recent years, with the continuous deepening and expansion of exploration and development deployment of oil and gas fields, the scale of fracturing modification is increasing day by day. In particular, the application of the large-scale volume fracturing process of the shale gas enables the amount of single-well fracturing fluid entering the ground to be close to 5 ten thousand square. Thus, there is a problem associated with returning a large amount of fracturing fluid to the feedwater treatment.
At present, the treatment methods for fracturing flowback fluid mainly comprise discharge, reinjection, recycling and the like. In view of the cost reduction, the whole is preferably recycled. But is influenced by factors such as construction operation period, contradiction between liquid drainage and storage scale, coordination and scheduling management, and performance index defects of repeated liquid, and the like, and the repeated utilization of the liquid returning under pressure cannot be completely realized. Generally speaking, it is not easy to achieve an annual fluid return utilization rate of 60%.
At present, the domestic and foreign water treatment technologies are various, such as electrocatalytic oxidation + MBR membrane technology, electrocatalytic oxidation + EDI desalination + biochemical technology, chemical agent oxidation flocculation technology, activated sludge combined membrane filtration technology, multi-stage flash evaporation (MSF), multi-effect distillation (MED) technology, Reverse Osmosis (RO) technology, Electrodialysis (ED) technology and the like. Different process combinations are selected to realize different degrees of treatment of the press-return liquid and the formation water, and the index requirements of discharge or reinjection are met. However, due to the influence of high cost of sewage transportation, treatment equipment, chemical agents and the like, the discharge cost of the sewage per cubic meter is generally over 100 yuan at present. Although the cost for treating the reinjection is low, the reinjection well is difficult to select and is difficult to popularize due to high environmental protection pressure.
Disclosure of Invention
The applicant of the present application has noted that for each gas well, several processes such as fracturing construction, flowback after fracturing and blowout ignition testing are required. During the open-jet ignition test, the gas is directly burned, and the heat value burned by the flame is often wasted.
Therefore, aiming at the technical problems, the invention creatively provides a method for evaporating the fracturing fluid produced in the fracturing construction process by using the combustion heat value produced in the open-flow ignition test process, so that the fracturing fluid can be treated in a very environment-friendly manner at low cost.
According to the present invention, there is provided an atomizing device for evaporating return liquid, comprising: the blowout pool is used for receiving the pressure return liquid, and blowout ignition can be performed in the blowout pool; the storage tank is used for temporarily storing the pressure return liquid; the atomization spraying assembly comprises a spray pipe and a nozzle which is connected with the spray pipe and extends into the blowout pool; and the valve control mechanism is connected with the spraying tank, the storage tank and the atomization spraying assembly. Wherein the valve control mechanism is configured to selectively deliver the return hydraulic fluid from the blow tank to the storage tank for storage or to the atomizing spray assembly for injection into the blow tank through the nozzle.
In a preferred embodiment, the valve control mechanism is configured to deliver the pressurized return fluid from the blow tank to the storage tank for storage when a predetermined amount of pressurized return fluid in the blow tank is reached but the blow-off ignition condition is not met.
In a preferred embodiment, the valve control mechanism is configured to deliver the pressurized return fluid from the blowout pool into the atomizing spray assembly when a predetermined amount is exceeded in the pressurized return fluid in the blowout pool and blowout is ignited, such that the pressurized return fluid can be vaporized within the blowout pool by the ignition flame.
In a preferred embodiment, the return fluid is injected through the nozzle above the ignition flame.
In a preferred embodiment, a first pump is arranged on a first pipeline connecting the valve control mechanism and the blowout pool and used for pumping the pressure return liquid in the blowout pool.
In a preferred embodiment, the valve control mechanism is further configured to deliver the liquid return from the storage tank to the atomizing spray assembly when the thermal energy provided by the open-jet ignition flame is greater than the energy required to instantaneously vaporize the liquid return, such that the liquid return can be vaporized within the open-jet bath by the ignition flame.
In a preferred embodiment, a second pump is provided on a third line connecting the valve control mechanism and the storage tank for pumping back-pressure liquid in the storage tank.
In a preferred embodiment, the nozzle is a combination of spiral, straight and cross nozzles.
In a preferred embodiment, a filter screen is provided at the nozzle.
In a preferred embodiment, the blowing pool is connected with the valve control mechanism through a water suction port, and the water suction port is in a structure of a one-way valve steel pipe.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 shows a schematic block diagram of an atomizing device according to the present invention.
Detailed Description
The present invention will be described below with reference to the accompanying drawings.
In the process of exploration and development of oil and gas resources, almost every gas well needs to undergo several processes such as fracturing construction, flow-back after pressure, open flow ignition test and the like. During the open-jet ignition test, the gas is directly burned, and the heat value burned by the flame is often wasted. Meanwhile, a large amount of fracturing fluid is generated in the fracturing construction, and both of them need to be treated. The treatment of the press return liquid is not only very costly, but also presents certain environmental risks. Based on the above, the invention creatively utilizes the heat energy generated in the open-flow ignition test process to evaporate the pressure return liquid, thereby being capable of treating the pressure return liquid in a very environment-friendly way without increasing any cost.
The atomizing device 100 according to the present invention includes a blow tank 10. The blow-out tank 10 is used for receiving and storing return hydraulic fluid generated during exploration and development of oil and gas resources through a pipeline, not shown.
The blow tank 10 is connected to a first pipeline 15 through a suction port 12 provided at an upper portion thereof. In one example, the water intake 12 is a one-way valve steel pipe. Therefore, liquid backflow can be prevented, and the safety of the whole atomization device under high temperature for a long time is ensured. The first line 15 may be, for example, a water-absorbent wire hose. The drain pipe 15 is provided with a first pump 20. By the operation of the first pump 20, the return hydraulic fluid can be pumped from the open flow cell 10 into the first pipeline 15 while ensuring a certain lift and displacement.
The atomizing device 100 according to the present invention further includes a valve control mechanism 30. The valve control mechanism 30 is connected to a storage tank 50 for temporarily storing the hydraulic fluid return through a second line 16 and a third line 17 in addition to the first line 15. In addition, the valve control mechanism 30 is connected to the blow-out tank 10 through a fourth line 18. The valve control mechanism 30 and these lines will be described in detail below.
Specifically, the valve control mechanism 30 is connected to the storage tank 50 through the second line 16. The second line 16 may be, for example, a hose. In the initial stage of the liquid discharge after the fracturing construction, the gas well flowback objects are mainly made of the pressure flowback liquid, and the discharged pressure flowback liquid flows into the blowout pool 10. As the amount of the pressurized return fluid in the blowout pool 10 increases, when the pressurized return fluid in the blowout pool 10 reaches a predetermined amount but does not satisfy the blowout ignition condition, the valve control mechanism 30 pumps the pressurized return fluid out of the blowout pool 10 through the first pipeline 15 by the first pump 20 and directly transfers the pressurized return fluid to the storage tank 50 for storage. It is easily understood that the above-mentioned "predetermined amount" can be appropriately selected by those skilled in the art according to the specific situation.
In addition, the valve control mechanism 30 is connected to the blow-out tank 10 through a fourth line 18. And an atomization spraying assembly is arranged on the fourth pipeline. In accordance with the present invention, the atomizing spray assembly includes a spray tube 60 and a spray nozzle 70 connected to the spray tube 60 and extending into the open spray basin 10. The nozzle 60 may be generally made of a high strength, high temperature resistant, and lightweight material. The nozzle 70 is configured to enable the pressurized return liquid to enter the blow-off pool 10 in an atomized form. In a preferred embodiment of the present invention, the nozzle 70 is a combination of spiral, straight and cross type nozzles. The combined nozzle has the advantages of large liquid discharge capacity, small atomized liquid drops, controllable atomization height area, convenience in replacement and maintenance and the like.
Along with the progress of fracturing construction, the flowing back is more and more. When the amount of the pressure return fluid exceeds a preset amount, the natural gas produced by the gas well is increased gradually to meet the ignition requirement, so that ignition and combustion are needed. According to the present invention, upon the occurrence of a blowout ignition in the open-flow cell 10 by exceeding a predetermined amount in the return-pressure liquid in the open-flow cell 10, the valve control mechanism 30 delivers the return-pressure liquid delivered from the reservoir tank 50 through the first line 15 to the atomizing spray assembly. Thus, the pressurized return fluid enters the atomizing spray assembly through the fourth line 18 and is sprayed into the open spray basin 10 through the spray nozzles 70 after passing through the spray bar 60. Preferably, the liquid is injected through the nozzle 70 above the ignition flame and is thereby vaporized by the ignition flame. Thus, according to the invention, at the initial stage of the post-press return discharge, the heat energy of the ignition flame which is wasted originally can be utilized to directly evaporate the return liquid, so that the return liquid can be treated without any extra cost, and meanwhile, no danger in the aspect of environmental protection is generated.
The atomization device can improve the flame heat energy utilization rate by more than 30 percent, thereby obviously improving the evaporation efficiency of the return liquid.
According to a preferred embodiment of the present invention, a filter screen (not shown) is further provided at the nozzle 70. Thus, larger particles of impurities can be filtered through the filter screen, and the nozzle 70 is ensured not to be blocked. The mesh size of the filter screen may be optimized according to the size of the nozzle.
As the post-fracturing fluid discharge continues, the amount of the fracturing fluid discharged with the gas returns gradually decreases. Therefore, according to the invention, the valve control means 30 is also connected to the storage tank 50 via the third line 17. A second pump 40 is provided in the third line 17 for pumping out the return liquid in the tank 50.
Thus, when the heat energy provided by the flame ignited by the blowout is greater than the energy required to instantaneously evaporate the liquid return, the valve control mechanism 30 pumps the liquid return from the storage tank 50 through the third line 17 via the second pump 40, and delivers the liquid return to the atomizing spray assembly after passing through the nozzle 60. Thus, the return hydraulic fluid also enters the atomizing spray assembly through the fourth line 18 and is sprayed into the open-flow cell 10 through the spray nozzle 70. The liquid is preferably sprayed through the nozzle 70 above the ignition flame so as to be evaporated by the ignition flame. Therefore, in the middle stage of the after-pressure return discharge, the heat energy of the ignition flame can be utilized to evaporate the return liquid, so that the return liquid is disposed in an environment-friendly manner.
According to the invention, the valve control mechanism can be used for carrying out different treatments on the pressure return liquid under different conditions, so that the pressure return liquid is temporarily stored, or is reintroduced into the blowout pool to be evaporated by the ignition flame, or is introduced into the blowout pool from the temporary storage place to be evaporated by the ignition flame. Therefore, the evaporation efficiency of the returned effluent in the testing and pilot mining processes can be fully improved, and the cost is low.
The nozzle 60 and the nozzle 70 may be optimally designed according to the present invention. Generally speaking, the nozzle can be optimally designed from the aspects of the whole structure, the number of nozzles, the angle of the nozzles, the size specification of the nozzles, the combination and collocation form of the nozzles and the like through multiple calculations and field tests, and the nozzle is ensured to have the atomizing form consistent with the flame form. Therefore, the overlap ratio of the flame and the water mist can be ensured to be higher, and the atomization evaporation efficiency is improved to the maximum extent.
The following describes the test of the evaporation of the return liquid using the atomizing device 100 according to the present invention. The test yield of a certain well is 5 ten thousand in one day, and the daily yield is 30 in one day. The calculation results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the heat generated by burning 5 ten thousand squares of natural gas per day is 200X 104MJ, and the heat required to evaporate 30 cubes of water is 7.78X 104MJ. Thus, theoretically, evaporation of all of the flowback fluid can be achieved as long as the heat utilization of the combustion flame exceeds 3.89%. Through field tests, the heat utilization rate of combustion flame of the atomization evaporation device can reach more than 10%, and the treatment problem of the return liquid can be completely solved.
In addition, the on-site tracking analysis shows that more than 99% of the return press liquid is water vapor after evaporation, and about 1% of solid evaporation products exist. Obviously, the water vapor has no effect on the ambient environment. A certain amount of evaporation products are taken, the content of organic matters in the evaporation products is analyzed through an energy spectrum analyzer, the content of various ions in the evaporation products in unit mass is analyzed through an ion chromatographic analyzer, and the content of heavy metals in the evaporation products is measured through equipment such as an atomic fluorescence spectrophotometer, an atomic absorption spectrophotometer and an inductively coupled plasma emission spectrometer. The solid substances evaporated are mainly sodium chloride and calcium carbonate, do not contain heavy metals, and do not harm surrounding soil, water quality and atmosphere. Moreover, the solid particles are mainly concentrated in the range of 2-5 m around the ignition blow-off pool, and can be collected and treated by means of the evaporative product falling-off-ground prevention.
From the above, the atomizing device according to the present invention can treat the press-back liquid in a very environmentally friendly manner.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. An atomizing device for evaporating return liquid, comprising:
a blowout pool (10) for receiving the pressure return liquid, in which blowout ignition can be performed;
a storage tank (50) for temporarily storing the pressure-return liquid;
an atomizing spray assembly comprising a spray tube (60) and a spray nozzle (70) connected to said spray tube and extending into the blow down tank; and
a valve control mechanism (30) connected with the spraying tank (10), the storage tank (50) and the atomization spraying component,
wherein the valve control mechanism (30) is configured to selectively deliver the return hydraulic fluid from the blow tank (10) to the storage tank (50) for storage or to the atomizing spray assembly for injection through the nozzle into the blow tank (10).
2. The atomizing device according to claim 1, characterized in that the valve control mechanism (30) is configured to deliver the pressure-returned liquid from the blow tank (10) to the storage tank (50) for storage when a predetermined amount of pressure-returned liquid in the blow tank (10) is reached but a blow ignition condition is not satisfied.
3. The atomizing device of claim 2, wherein the valve control mechanism (30) is configured to deliver the pressurized return fluid from the blow tank (10) into the atomizing spray assembly when a predetermined amount is exceeded in the pressurized return fluid in the blow tank (10) and blow ignition is performed, such that the pressurized return fluid can be vaporized within the blow tank (10) by an ignition flame.
4. The atomizing device of claim 3, wherein the hydraulic fluid is injected through the nozzle above the ignition flame.
5. Atomisation device according to any of the previous claims 1 to 4 characterized in that a first pump (20) is provided on the first line (15) connecting the valve control means (30) and the blow-off basin (10) for pumping back hydraulic liquid from the blow-off basin (10).
6. The atomizing device of claim 3, wherein said valve control mechanism (30) is further configured to deliver the return liquid from said storage tank (50) to said atomizing spray assembly when the thermal energy provided by the flare-firing flame is greater than the energy required to instantaneously vaporize said return liquid, such that said return liquid can be vaporized within said flare pool (10) by the firing flame.
7. Atomisation device according to claim 6, characterised in that a second pump (40) is provided on a third line (17) connecting the valve control means (30) and the storage tank (50) for pumping back the hydraulic fluid in the storage tank (50).
8. The atomizing device according to any one of claims 1 to 4, wherein the nozzle is a combination of a spiral type, a straight type and a cross type nozzle.
9. The atomizing device according to any one of claims 1 to 4, characterized in that a filter screen is provided at the nozzle.
10. The atomizing device according to any one of claims 1 to 4, characterized in that the blow-out basin (10) is connected to the valve control mechanism (30) via a water suction port (12), and the water suction port (12) is in the form of a one-way valve steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811196573.0A CN111035948A (en) | 2018-10-15 | 2018-10-15 | Atomizing device for evaporating pressure return liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811196573.0A CN111035948A (en) | 2018-10-15 | 2018-10-15 | Atomizing device for evaporating pressure return liquid |
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| CN111035948A true CN111035948A (en) | 2020-04-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012825A (en) * | 2007-02-08 | 2007-08-08 | 福建医科大学 | Hydraulic controller of double acting reciprocating pump |
| CN104261497A (en) * | 2014-07-23 | 2015-01-07 | 中国科学院广州能源研究所 | Bubbling negative-pressure evaporation seawater desalination device and production method |
| CN104556278A (en) * | 2015-01-15 | 2015-04-29 | 济南祥丰能源技术有限公司 | Solar energy and wind energy combined passive vacuum sea water desalination device |
| CN207483395U (en) * | 2017-09-15 | 2018-06-12 | 靖边县炳鑫油井技术服务有限公司 | Environment-friendly type burning vaporising device gas well returns drain distillation processing system |
| CN207880842U (en) * | 2018-02-27 | 2018-09-18 | 四川康克石油科技有限公司 | A kind of innoxious burning vaporising device of pit shaft waste liquid |
-
2018
- 2018-10-15 CN CN201811196573.0A patent/CN111035948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012825A (en) * | 2007-02-08 | 2007-08-08 | 福建医科大学 | Hydraulic controller of double acting reciprocating pump |
| CN104261497A (en) * | 2014-07-23 | 2015-01-07 | 中国科学院广州能源研究所 | Bubbling negative-pressure evaporation seawater desalination device and production method |
| CN104556278A (en) * | 2015-01-15 | 2015-04-29 | 济南祥丰能源技术有限公司 | Solar energy and wind energy combined passive vacuum sea water desalination device |
| CN207483395U (en) * | 2017-09-15 | 2018-06-12 | 靖边县炳鑫油井技术服务有限公司 | Environment-friendly type burning vaporising device gas well returns drain distillation processing system |
| CN207880842U (en) * | 2018-02-27 | 2018-09-18 | 四川康克石油科技有限公司 | A kind of innoxious burning vaporising device of pit shaft waste liquid |
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